The addition of alum Must fill soda ash prior to the PH higher ratio of soda ash for about 30% of alum as alum, 10 kg will need to use soda ash 3 kg together with the PH value must be in the 7.4 - 7.6 PPM. . water chemistry of G. PH below 7.2 add soda ash 1 kg / 100 queue PH above 7.8, add hydrochloric acid 1 kg / 100 queue chlorine 0.6 chlorine 90%, 150 g / 100 queue chlorine one. chlorine 90%, 100 g / 100 queue.
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